Quick water heater

ABSTRACT

A quick water heater includes a housing, a water tank, a heating device having an inlet and an outlet, a water pump, a water outlet, a NTC thermistor, and a control circuit board. The water pump is connected between the water tank and the inlet by two water pipes. The water outlet is connected with the outlet. The control circuit board is electrically connected with the heating device and the water pump. The control circuit board includes a first SCR cooperating with the NTC thermistor to control the water pump on or off and a second SCR cooperating with the NTC thermistor to control power of the heating device. When the water temperature of the water outlet reaches to a predetermined temperature, the NTC thermistor sends out a feedback signal to the control circuit board, and then the control circuit board cuts off a power supply of the heating device.

BACKGROUND

1. Technical Field

The present disclosure relates to a quick water heater.

2. Description of Related Art

A typical water heater generally works with full power, when the water temperature of the water heater reaches to 95 degrees centigrade, a thermistor can not timely send out a feedback signal to a relay, and the relay can not timely cut off the power supply of a heating device, that leads to eject the vapor from the water heater. In addition, no sensor detects the temperature of the heating device, and the vapor is often ejected from the water heater due to the overheated heating device.

What is needed, therefore, is a quick water heater which overcomes the above-mentioned problems.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above drawbacks in the prior art, and it is therefore an object of the present invention to provide a quick water heater.

The quick water heater includes a housing, a water tank, a water pump, a heating device, a control circuit board and a water outlet. The water tank, the water pump, the heating device, the control circuit board and the water outlet are disposed in the housing. The heating device has a cold water inlet and a hot water outlet. The water pump is connected between the water tank and the cold water inlet of the heating device by two water pipes. The water outlet is connected with the hot water outlet of the heating device. The control circuit board is electrically connected with the heating device and the water pump. A first NTC (based on Negative Temperature Coefficient) thermistor is disposed at the water outlet for controlling the water temperature of the water outlet. The control circuit board includes a first SCR (Silicon Controlled Rectifier) which cooperates with the first NTC thermistor to control the water pump on or off and a second SCR (Silicon Controlled Rectifier) which cooperates with the first NTC thermistor to control a power of the heating device. When the water temperature of the water outlet reaches to a predetermined temperature, the first NTC thermistor sends out a feedback signal to the control circuit board, and then the control circuit board cuts off a power supply of the heating device.

The quick water heater further includes a second NTC thermistor disposed on the heating device for preheating and protecting due to over temperature. The second NTC thermistor detects the temperature of the heating device and sends out a feedback signal to the control circuit board, and the control circuit board controls the power of the heating device via the second SCR.

The quick water heater further includes a water flow meter disposed on the water pipe between the water pump and the heating device to detect the water flow in the water pipe.

The quick water heater further includes a button disposed at the water outlet for controlling the hot water on or off.

The first NTC thermistor detects the water temperature of the water outlet, and then the first NTC thermistor sends out a feedback signal to the control circuit board, and the control circuit board controls the water pump on or off via the first SCR, whereby a total flow of the water pump in a certain time is controlled. At the same time, the second SCR instead of relay controls the power of the heating device. Before the water temperature of the water outlet reaches to the boiling point, the first NTC thermistor detects the water temperature of the water outlet, and then the control circuit board lowers the power of the heating device via the second SCR to prevent the temperature of the heating device from continuing to rise, thereby preventing the water in the heating device from being overheated to eject the vapor. When the water temperature is low, the heating device works with full power, and at the same time, the flow of the water pump is accordingly lowered, therefore, the water in the heating device is heated to over degrees centigrade in a short time. When the water temperature is too high, the heating deice works with lower power, and at the same time, the flow of the water pump is accordingly increased, thereby preventing the quick water heater from ejecting the vapor from the water outlet. In a word, the quick water heater keeps the water temperature in a stable state due to the cooperation between the power of the heating device and the flow of the water pumps.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present apparatus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present apparatus. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a cross-sectional schematic diagram of a quick water heater in accordance with an embodiment of the disclosure.

FIG. 2 is a schematic circuit diagram of the quick water heater of FIG. 1.

DETAILED DESCRIPTION

Referring to FIGS. 1-2, a quick water heater in accordance with an embodiment of the disclosure is illustrated. The quick water heater includes a housing 1, a water tank 2, a water pump 3, a heating device 4, a control circuit board 5 and a water outlet 6. The water tank 2, the water pump 3, the heating device 4, the control circuit board 5 and the water outlet 6 are disposed in the housing 1. The heating device 4 has a cold water inlet 41 and a hot water outlet 42. The water pump 3 is connected between the water tank 2 and the cold water inlet 41 of the heating device 4 by two water pipes 11. The water outlet 6 is connected with the hot water outlet 42 of the heating device 4 by an additional water pipe 11. The control circuit board 5 is electrically connected with the heating device 4 and the water pump 3. A first NTC (based on Negative Temperature Coefficient) thermistor 71 is disposed at the water outlet 6 for controlling the water temperature of the water outlet 6. When the water temperature of the water outlet 6 reaches to a predetermined temperature, the first NTC thermistor 71 sends out a feedback signal to the control circuit board 5, and then the control circuit board 5 cuts off a power supply of the heating device 4. The control circuit board 5 includes a first SCR (Silicon Controlled Rectifier) 51 which cooperates with the first NTC thermistor 71 to control the water pump 3 on or off and a second SCR (Silicon Controlled Rectifier) 52 which cooperates with the first NTC thermistor 71 to control a power of the heating device 4.

The first NTC thermistor 71 detects the water temperature of the water outlet 6, and then the first NTC thermistor 71 sends out a feedback signal to the control circuit board 5, and the control circuit board 5 controls the water pump 3 on or off via the first SCR 51, whereby a total flow of the water pump 3 in a certain time is controlled. At the same time, the second SCR 52 instead of relay controls the power of the heating device 4. Before the water temperature of the water outlet 6 reaches to the boiling point, the first NTC thermistor 71 detects the water temperature of the water outlet 6, and then the control circuit board 5 lowers the power of the heating device 4 via the second SCR 52 to prevent the temperature of the heating device 4 from continuing to rise, thereby preventing the water in the heating device 4 from being overheated to eject the vapor. When the water temperature is low, the heating device 4 works with full power, and at the same time, the flow of the water pump 3 is accordingly lowered, therefore, the water in the heating device 4 is heated to over 90 degrees centigrade in a short time. When the water temperature is too high, the heating deice 4 works with lower power, and at the same time, the flow of the water pump 3 is accordingly increased, thereby preventing the quick water heater from ejecting the vapor from the water outlet 6. In a word, the quick water heater keeps the water temperature in a stable state due to the cooperation between the power of the heating device 4 and the flow of the water pumps 3.

Referring to FIGS. 1-2 again, the quick water heater further includes a second NTC (based on Negative Temperature Coefficient) thermistor 72 disposed on the heating device 4 for preheating and protecting due to over temperature. The second NTC thermistor 72 detects the temperature of the heating device 4, and then the second NTC thermistor 72 sends out a feedback signal to the control circuit board 5, and the control circuit board 5 controls the power of the heating device 4 via the second SCR 52. When the temperature of the heating device 4 is too high, the second NTC thermistor 72 detects the high temperature of the heating device 4 and sends out a feedback signal to the control circuit board 5, and then the control circuit board 5 lowers the power of the heating device 4 via the second SCR 52, thereby preventing the quick water heater from ejecting the vapor from the water outlet 6 due to the overheated heating device 4.

The quick water heater further includes a water flow meter 8 disposed on the water pipe 11 between the water pump 3 and the heating device 4 to detect the water flow in the water pipe 11. When the water flow meter 8 detects the water flow in the water pipe 11 between the water pump 3 and the heating device 4 and sends out a feedback signal to the control circuit board 5, and then the control circuit board 5 controls the water pump 3 on or off via the first SCR 51, whereby the quick water heater keeps the water temperature in a stable state.

The quick water heater further includes a button 9 disposed at the water outlet 6. When the button 9 is pressed, the hot water flows out of the quick water heater from the water outlet 6; when the button 9 is released, the hot water is kept in the quick water heater.

Finally, the above-discussion is intended to be merely illustrative of the disclosure and should not be construed as limiting the appended claims to any particular embodiment or group of embodiments. Thus, while the disclosure has been described with reference to exemplary embodiments, it should also be appreciated that numerous modifications and alternative embodiments may be devised by those having ordinary skill in the art without departing from the broader and intended spirit and scope of the disclosure as set forth in the claims that follow. In addition, the section headings included herein are intended to facilitate a review but are not intended to limit the scope of the present system. Accordingly, the specification and drawings are to be regarded in an illustrative manner and are not intended to limit the scope of the appended claims. 

What is claimed is:
 1. A quick water heater comprising: a housing; a water tank disposed in the housing; a heating device disposed in the housing, the heating device having a cold water inlet and a hot water outlet; a water pump disposed in the housing, the water pump being connected between the water tank and the cold water inlet of the heating device by two water pipes; a water outlet disposed in the housing, the water outlet being connected with the hot water outlet of the heating device; a NTC (based on Negative Temperature Coefficient) thermistor disposed at the water outlet for controlling the water temperature of the water outlet; and a control circuit board disposed in the housing, the control circuit board being electrically connected with the heating device and the water pump, the control circuit board comprising a first SCR (Silicon Controlled Rectifier) which cooperates with the NTC thermistor to control the water pump on or off and a second SCR which cooperates with the NTC thermistor to control a power of the heating device, when the water temperature of the water outlet reaches to a predetermined temperature, the NTC thermistor sends out a feedback signal to the control circuit board , and then the control circuit board cuts off a power supply of the heating device.
 2. The quick water heater as claimed in claim 1 further comprising an additional NTC thermistor disposed on the heating device for preheating and protecting due to over temperature, wherein the additional NTC thermistor detects the temperature of the heating device and sends out a feedback signal to the control circuit board, and the control circuit board controls the power of the heating device via the second SCR.
 3. The quick water heater as claimed in claim 1 further comprising a water flow meter disposed on the water pipe between the water pump and the heating device to detect the water flow in the water pipe.
 4. The quick water heater as claimed in claim 2 further comprising a water flow meter disposed on the water pipe between the water pump and the heating device to detect the water flow in the water pipe.
 5. The quick water heater as claimed in claim 1 further comprising a button disposed at the water outlet for controlling the hot water on or off. 